Hardfacing alloy

Abstract

A hardfacing alloy for use as a surfacing on metal that are subjected to high thermal and mechanical stresses. The hardfacing alloy includes at least about 7 weight percent chromium, at least about 0.02 weight percent nitrogen, metal sensitization inhibitor, and a majority weight percent iron. The hardfacing alloy includes a low percentage of ferrite.

We claim: 
     
       1. A hardfacing alloy for application to a metal surface having a hardness of about 25-65 RC and a wear rating of about 1-3 g ASTM G-65, said hardfacing alloy consisting of by weight percent: 
       
         
           
                 
                 
                 
               
                     
                     
                 
                     
                   C 
                   0.05-0.3%; 
                 
                     
                   Cr 
                   10-18%; 
                 
                     
                   Mn 
                   0.5-5%; 
                 
                     
                   Mo 
                   0.2-4%; 
                 
                     
                   N 
                   0.05-0.25%; 
                 
                     
                   Nb 
                   over 0.5 and up to 2%; 
                 
                     
                   Ni 
                   1-9%; 
                 
                     
                   V 
                   0.1-0.4%; and 
                 
                     
                   Fe 
                   60-88%. 
                 
                     
                     
                 
             
                
               
               
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
     
     
       2. A hardfacing alloy for application to a metal surface having a hardness of about 25-65 RC and a wear rating of about 1-3 g ASTM G-65, said hardfacing alloy consisting of by weight percent: 
       
         
           
                 
                 
                 
               
                     
                     
                 
                     
                   C 
                   0.1-0.2% 
                 
                     
                   Cr 
                   10-15% 
                 
                     
                   Mn 
                   1-3% 
                 
                     
                   Mo 
                   0.5-2% 
                 
                     
                   N 
                   0.05-0.2% 
                 
                     
                   Nb 
                   over 0.5 and up to 1.5% 
                 
                     
                   Ni 
                   3-6% 
                 
                     
                   V 
                   0.1-0.3%; and 
                 
                     
                   Fe 
                   65-85%